Re: kernel bug in socketpair()

[Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>]

On Mer, 2003-07-23 at 17:56, Glenn Fowler wrote:
> you can eliminate the security implications for all fd types by
> simply translating
>       open("/dev/fd/N",...)
> to
>       dup(atoi(N))
> w.r.t. fd N in the current process

This has very different semantics. Consider lseek().

> otherwise there is a bug in the /dev/fd/N -> /proc/self/fd/N implementation
> and /dev/fd/N should be separated out to its (original) dup(atoi(N))
> semantics

I don't see a bug. I see differing behaviour between Linux and BSD on a
completely non standards defined item. Also btw nobody ever really wrote
a /dev/fd/ for Linux - it was just a byproduct of the proc stuff someone
noticed. I guess someone could write a Plan-9 style dev/fd or devfdfs
for Linux if they wanted.

Alan